Used approximately 50 gallon vertical stainless steel sanitary polished jacketed tank. Internal 50 PSI/Full Vacuum @ 200 degress F. Jacket 125 psi @ 200 degrees. F. Dished top. Slight Conical Bottom. S/N: A 9219-W1 Built 1984. NB 3433 Built by Lee. 3 legs on castors.